Punch press tool



v. R. HEFTLER PUNCH mass woo:-

Filed Jan. 11. 19:57

June 18, 1940.

2 Sheets-Sheet 1 a 2 r F 1 1 ,4. m 7 z w 3 r ky i I A, 17 z i v X MW m I N 4 1 Z I. Z -LHZ, 2 W} 5c 2 5 4% 2 k i u m M w June 18, 1940.

v. R. HEFTLER 2,204,592

PUNCH PRESS TOOL Filed Jan. 11-, 1937 2 Sheets-Sheet 2 i -1 5% 5"! 'm??0 |fl' %"m) 1 6:5 i .E. W M O W Q M E Patented June 18, 1940 UNITED STATES PATENT oFricE Victor B. Heftlcr, Grosse Pointe Park, Mich. Application January 11, 1937, Serial No. 120,008

13-Claims.

The object of this invention is a progressive punch press tool for piercing or forming and for blanking out of the mother stock two or more types of pieces and delivering the same in such cession to a convenient holder so as to form thereby a stack of pieces wherein the different types of pieces are arranged in a definite and recurring order.

Within the purview'oi this invention, pieces of one type may differ from those of another type in absolute form or in relative orientation in the stack.

Though the invention may be used whenever it is desired to form and deliver a continuous series of two or three or more types of pieces arranged in definite recurring sequence or order, it is particularly adapted to theformation and stacking of edge type filters such as are described in Letters Patent No. 1,641,485, issued to the trade-mark Zenith.

Filters of this type, which comprise a stack of two different forms of elements placed in alternation, were originally made by punching the two forms of elements out of separate strips of material and then assembling the elements in the desired alternate order by hand.

An improved method of forming such filter stacks is disclosed in Patent No. 1,694,939, issued 0, to me on December 11, 1928, wherein one strip 01' material is run through a punch press which punches at one stroke the perforations corresponding to each type of piece. Thereafter, this perforated strip of material is run through a blanking punch which blanks out one piece at a stroke in the order of alternation in which they already appear in the previously pierced strip, thus forming a stack of alternating pieces. The present invention combines the foregoing operations in one tool and effects great saving in ,labor.

While it will be understood that this invention may be applied to the manufacture of other products when it is desired to form and assemble a recurring series of two or three or more different types of pieces, the following description will disclose the invention as applied to the manufacture of the above mentioned edge type filter wherein there are but two types of pieces and the same are arranged in simple alternation. Reference will therefore be had to this specific application of the invention as shown in the accompanying drawings, wherein:

Fig. 1 is a front elevation of a tool built according to my invention.

Fig. 2 is a section on line 2-2 ofFig. 1, looking in the direction of the arrows.

Fig. 3 is a section on line 3-4 of Fig. 1, looking in the direction of the arrows.

Fig. 4 is a section on the line 4-4 of Fig. 1, looking in the direction of the arrows.

Figures 5, 6, 7 and 8 are views of the strip of material after one, two, three and four strokes of the punch press have been made.

Fig. 9 shows, at A and B, the two different types of pieces made by the particular tool described herein and the orientation of the pieces with respect to each other. It is to be noted that both type of pieces have a central square aperture so that, when pieces of both types are alternately stacked upon a square stem, the assembly constitutes an "edge type filter of the well-known type. 0

In so-called progressive dies, the work to be performed is divided into several operations, and the material is fed, by hand or automatically, so that it is successively submitted to the various operations. During these operations, the piece remains fixed to the mother stock, while it is moved from one station to the next and it is only at the final station, usually called the blanking out station, that the final ties are sheared and that thecompleted piece falls through the blanking die. The tool hereafter described works on a modification of this principle, the stock being fed from the left to right in Fig. 1.

This tool comprises a die holder H adapted to be secured to the bolster plate of an ordinary punch press of suitable size.

The die holder II, as shown in Fig. 4, is fitted with preferably removable dies FHA and SIB arranged to cooperate with pattern punches 19A and ISB in order to cut out or otherwise form the two different patterns of perforations or other features that characterize the pieces A and B, as well as the central square aperture, common to both patterns. The die holder II also holds a blanking die 4i, and the distance between the blanking die I and the die HA is an exact multiple of the distance between dies EIA and MB. The latter distance is conveniently called the pitch of the tool. The punches [9A and IBB are fastened to a pattern punch holder l8, bored out to slide upon guide pins -Il pressed in the die holder II, as is well-known in the art. These guide pins serve to maintain the punches in exact alignment with the corresponding dies.

Cooperating with blanking die 4| is a blanking punch I4 fastened to a blanking punch holder IS. The holder 15 is bored out to slide upon two prises guide pins I6 which are a press fit in the die holder 'I I. The blanking punch holder I ils in turn fastened to an upper bolster plate I2, provided with a shank I3 for attachment in the conventional manner to the ram of the punch press in which the tool is to be used. It will be seen that, at each stroke of the punch press, the blanking punch I4 will enter the blanking die 4I.

The'pattern punch holder I8, however, is not fastened to; the upper bolster plate, but an escapement is provided so that, on every other stroke of the press, the pattern punches ISA and I913 will be carried down far enough to enter the punches 5IA and SIB, while on alternate strokes it will not be carried down that far. The escapement, whereby this alternation between punching and non-punching strokes is obtained, coma ratchet 20 mounted on a shaft 2| suitably journaled in the upper bolster plate I2 and held by theretaining collar 22. This ratchet 20 is preferably made integral witha clutch 23, and

I the pattern punch holder I8 is provided with a "a pivotpin 26,on v to actuate the ratchet 20. Pivoted on a shoulder corresponding clutch 24. The teeth of the clutches are of the same width as the spaces between the teethgexcept for the clearance necessaryr'to allow the teeth of one clutch to enter freely the spacesof the other.

A slide 25, suitably guided in a, groove cut in the underside. of the upper bolster plate l2 and capable of reciprocating therein, is provided with which is journaled a pawl 21 pin-'28 screwed into theupper bolster plate I2 is a second awl 29 as p which also engages ratchet 20 to prevent its rotation while pawl 21 slides back to engage the succeeding tooth. The slide 25 is to cooperate with-a corresponding cam surface, 3|.formed at the upper end of a slide actuating 40.

formed with an inclined cam surface 30 adapted member 32 which is fastened .to the die holder II by suitable means, such as screws 33. A tension spring. 34 is fastened at one .end to the upper pression springs 31 and 38 to normally support the weight of thepattern-punches I9A and I9B and of their holder I8.

When the ram of the press makes a downward stroke, the blankin punch holder I5 will be carried therewith, but the pattern punch holder will be carried down a full stroke only when the teeth of the two clutches 23 and 24 are in registration, as shown in the drawings. If, howev'e'r, the teeth of clutch 23 are opposite the spaces in the clutch 24, the pattern punches will not be pushed down far enough to reach and piercethe material.

Fig. 5 shows the appearance of the material after the first stroke of the press, assuming that the position of the clutches 23 and 24 is such that the teeth are in registration so that the pattern punches ISA and ISB are active. I have designated by, the symbols AI and BI the two different patterns pierced by the punches ll 9A and IQB on the first stroke of the press. During this down stroke, the upper bolster plate I2 and the slide 25 move downward, while the die holder II remains stationary on the bolster plate of the press. This permits the slide 25 to be retracted under the pull of spring 34, and the cam surfaces 30 and .3 are such that this movement is suflicient for the pawl 21 to engage the next tooth of ratchet 20.

On the upstroke, cam surface 30 slides over cam surface 3|, and the slide is moved a sufficient distance to turn ratchet 20 the width of one tooth, carrying with it clutch .23, so that its teeth are no longer opposite the teeth of clutch 24, but are opposite the spaces between teeth. It will be plain that, on the second down stroke, the pattern punch holder I8 will not be carried downward sufficiently to cause the pattern punches ISA and I9B to pierce the material worked upon.

Before this second down stroke takes place, the material has been fed forward to the position of Fig. 6, the amount of movement being equal to the pitc It will be noticed that the leading edge of the material has not yet reached the blanking die, and the material presents the appearance shown in Fig. 6, after the second down stroke of the press.

On the second upstroke, the ratchet 20 has moved another tooth, so that, for the third down stroke, the teeth of the clutches 23 and 24 are again in opposition; the material is again fed forward one pitch before the third down stroke takes place. On' the third down stroke, the

pattern punches ISA and I9B will operate again 1 and pierce the material'at A3 and B3 (Fig. 7) while the blanking punch I4 cuts out and severs from the stock a first element having the AI pattern and shown separately at A, Fig. 9. Fig. 7 shows the material after this third down stroke.

'The piece just blanked out falls through the blanking die 4| onto a stem 42 held in a position to receive the parts as they successively fall through the blanking die 4|.

On the fourth down stroke, pattern punches ISA and I9B will not operate, but, the material in the meanwhile having again been fed one pitch to the position shown in Fig. 8, the blanking die will sever another piece from the material, this piece however being of the B pattern and the perforations in this piece being perforations Bl.

This cycle of operation will now be repeated as long as desired, the blanking punch I4 operating at every stroke while pattern punches ISA and I9B operate only on alternate strokes. In this manner, the stock is pierced with perforations of pattern A and with perforations of pattern B in regular recurring sequence, while the blanking punch alternately severs from the stock and lets fall through the blanking die 4| the two types of pieces A and B of Fig. 9.

It will readily be perceived by any man skilled in the art of punching metal, often called for short a diemaker," that some refinements might not be entirely useless. For instance, pilot holes might be punched in the material by suitable punches carried by the pattern punch holder, to cooperate wth pilot pins carried by the blanking punch holder I5, so as to assist in the positioning of the material at the beginning of each stroke. The feed might be made automatic, but it is not deemed necessary to describe here any such wellknown device as a roll feed or a push feed." Likewise, pressure pads, sliding on'the punch, to clamp the material solidly onto the die while the punch does its work. can with advantage be pro vided.

The particular embodiment of the invention above described is adapted to the formation of a comprises three or more different types. "Let N be the number of ,diiferent types, of pieces in, the

elementary group, then it will be sufiicient toprovide the patternpunch holder with N different ,punches and to sodesign the clutches 2 mg 24 that the teeth thereof are in opposition only once out of Nstrokes. Thisisaccomplishedbytmaking the width of the spaces equal to (NI) the width of the teeth, with allowance for clearance, and

is rotated the width of one tooth only.

.While ,I have shown only the embodiment of my invention that seems at present to be the us other ways. i even involvefurther invention, but any way which is based on the. same underying principles as the form of the invention. disclosed in this specificationand which falls within the scope of any of best, the invention may becarried out in numer- Some of these other ways may the followingclaims is at least partly my invention. The breadthof the patent is therefore not to be limitedby the particular device which I have shown and describedbut is to includeevery device which comes within the term of any of the following claims.

I claim:

blanking punch cooperating therewith, a plura-lity of pattern dies, a plurality of pattern punches corresponding thereto, means to cause cooperation between said pattern punches and said pattern dies, and means to cause said cooperation to occur or not according to a predetermined and recurring rhythm.

2. A progressive punch press tool for the purpose described comprising a blanking die, a plurality of pattern dies, a bolster plate, a blanking punch fastened thereto and cooperating with said blanking .die, a plurality of pattern punches, means to maintain said plurality of pattern punches in alignment with said pattern dies, means interposed between said bolster plate and said pattern punches to operate said pattern punches, and means to render said last mentioned means active or not according to a predetermined and recurring rhythm.

3. A progressive punch press tool for the purpose described comprising a blanking die, a blanking punch cooperating therewith, a plurality of pattern dies, a plurality of pattern punches corresponding thereto, means tocause cooperation between said pattern punches and said pattern dies, means to cause said cooperation to .occur or not according to a predetermined and recurring rhythm, and means in alignment with said blanking die to receive and hold pieces severed from the material worked upon by the blanking punch.

4. A progressive punch press tool for the purpose described comprising a blanking die, a plurality of pattern dies, at bolster plate, a blanking punch fastened thereto and cooperating with said blanking die, a plurality of pattern punches, means to maintain said plurality of pattern punches in alignment with said pattern dies, means interposed between said bolster plate and said pattern punches to operate said pattern punches, means to render said last mentioned means operative or not according to a predetermined and recurring rhythm, and means in alignment with said blanking die to r'eceive and hold pieces severed from ,thezmaterialworked upon by the blanking punch. a

5. A punch press tool' forblankingoutoi sheet material a recurring sequence ojfnon-id'entical pieces comprising a blanking die, a jfblanking punch cooperating therewith; as many :pattern dies as there are different pieces in the elementary :group of the sequence, pattern punches therefor, and .mean'slto render" said pattern punches inactive for as manyfsuccessive istrokes as there are different .piecesfinethe elementary group less one. by making the ratchet and the earns 30 and 3| l so that at every stroke of the press, the clutch 23 6. A progressive ,punchpress toolfor punching out of sheet material ,a sequence of identical groups of geometrically different'pieces, comprising a piercing station and a blanking station, there being at said piercing station as many piercing means'as there aredifferent pieces in means at said blanking station located \furthe'r along said line, means repeatedly actuate said said line, and means to actuate said piercing means only once while said blank means are actuated asmany times asthere are pieces in the group. 1

\ '7. A progressive punchpress tool for punching out of sheet material a sequence of identical groups of geometrically'different pieces,"comprising a piercing station anda blankingastation,

there being at said piercing stationas many piercing meansas there are diiferent pieces in each group, said piercing means being adapted to pierce geometrically different patterns and being located on the line along which the sheet material worked upon is adapted to be fed, blanking means at said blanking station located further along said line, means to repeatedly actuate said blanking means as the sheet material is fed along said line, and means to actuate said piercing means only while the blanking means blanks out the first piece of each group.

8. A progressive punch press tool for punching out of sheet material a sequence of identical groups of geometrically different pieces, comprising a piercing station and a blanking station, there being asaid piercing station 'asmany piercing means as there are different pieces in each group, said piercing means being adapted to pierce geometrically different patterns and being located on the line along which the sheetmaterial worked upon is adapted to be fed, blanking means at said blanking station located further along said line, means to repeatedlyactuate said blanking means as the sheet material'is fed along said line, and means to actuate sid piercingmeans only once while said blanking means are actuated, as many times as there are pieces in the group, and means to receive andhold pieces severedby said blanking means from the material worked upon.

9. A punch press tool for forming and stacking a recurring series of a plurality of types of stamped members comprising spaced stamping means for forming the characteristic features of each type of stamped member, receiving means spaced from said stamping means for receiving the different types of stamped members into a stack, means for feeding stock to each of the stamping means and for causing relative movement between the stock and the receiving means me n to cause the portions of thevstock carrying the characteristic features of the different typesof stamped members to lie in transferring relation ,to. the receiving means, and means for punching the different stamped members out of the stock and transferring them to the receiving 10. A punch press tool for forming and stacking a recurringseries of a plurality of types of stamped members comprising separate stamping -.tme a n s for forming at least the characteristic features of each of the separate types of stamped members receiving means spaced from the r -stamping means for receiving. the diiferent types of stamped members into a stack, means for feleding stock to each'of the stamping means and for causing relative movement between the stock and thereceiving means to cause the different stamped members formed at least in part by the 1 stamping means to hem successive transferring relation to the receiving means, and means for I successively removing the different stamped members from the stock and transferring them to the receiving means.

11. A punch press tool for forming and stacking a recurring series of a plurality of types of stamped members, comprising spaced stamping means for feeding stock to each of the means for means for forming the characteristic features of each type of stamped member, means for receiving the stamped members in a stack,

stamping the characteristic features of thedif- .r ferent types of stamped members and for causing relative movement between the stock and the means for receiving the stamped members in a stack inorder to cause the portions of the stock carrying-the characteristic features of the different types of stamped members to lie in transferring relation to the means for receivingthe stamped members in a stack, and means for punching the stamped members out of the stock and transferring them to the means for receiving the stamped members in a stack.

-12. A punch press tool for forming a series of stamped elements and stacking them in alternating'sequence comprising means for stamping patterns in sheet stack, means for'blanking out ofsaid stock the portions bearing said patterns. means for receiving said portions in alternate ar-' rangement after they are blanked out and for preventing them from rotating relative to each other after they are received by saidmeans, and means for causing said portions to move from said stamping means to said receiving means,

the paths along which alternate portions move rangement after they are, blankedout and for preventing them from rotating relative to each other after theyare received by said means, and means for causing said portions to move from said stamping means to said receiving means, the

paths along whichalternate portions move relative to the receiving means differing from each other in length but being coincident over the entire length of one path. v

vIc'roR R. HEF'I'YLER. 

